Knob attachment



(No Model.)

P. JONES & J. S. BROWNSON.

KNOB ATTACHMENT.

Patented Mar. 8, 1898.

WITNESSES A TTOHNE Y S.

UN TED. STATES PATENT OFFICE.

FREDERICK JONES AND JAMES S. BROWNSON, OF BROOKLYN, NEW YORK.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 600,368, dated March 8, 1898.

Application filed March 30, 1897.

To all whom, it may concern/.-

Be it known that we, FREDERICK J ONES and JAMES S. BEowNsoN, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Door-Knobs and Spindles, of which the following is afull, clear, and exact description.

The object of the invention is to so construct a spindle for a lock, especially the spindle for a door-lock, and the sleeve of the removable knob of the spindle that these two parts may be adj ustably connected in an expeditious and convenient manner without using a screw in the sleeve of the knob or making holes in the knob-spindle, as has been the custom heretofore.

Another object of the invention is to construct the knob sleeve and spindle in such a manner that although a screw is not used the two parts may be quickly separated, if necessary, and whereby, unless an intentional separation is made, the said parts will remain in the position to which they may have been set.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claim.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a vertical section through a portion of a door, showing, the application of the device to the knob and spindle, the spindle being in side elevation and the sleeve of the knob in vertical section. Fig. 2 is a plan view of a knob-spindle and knob having the improvement applied, the two parts being separated; and Fig. 3 is a vertical section on the line 3 3 of Fig. 1.

The spindle A is provided at one or both ends with two recesses 10 and 10 in its upper face, one below the horizontal plane of the other, and a spring 11 is secured at one of its ends to the outer end portion of the outer or deeper recess 10. The bottom wall of the inner recess 10 is straight, whereas the corresponding wall of the outer recess 10 is inclined from its center in opposite directions, the spring being secured to the outermost in- Serial Nd. 629,910. (No model.)

clined surface, whereby the free end of the spring will normally extend upward beyond the plane of the inner recess 10, but not higher than the plane of the corresponding face of the unrecessed portion of the spindle, enabling the spindle to be readily drawn through the look when the spindle is to be removed therefrom, it being impossible for the spring under this arrangement to engage with the wall of the spindle-aperture in the lock.

The sleeve 12 of one or both knobs is provided with a longitudinal slot 13, and the inner face of the sleeve at each side wall of said slot 13 has one or more (usually three) teeth 14 formed thereon. These teeth have each a vertical surface which faces the knob B and an inclined surface which is carried upward in direction of the inner end of the knobsleeve, as is clearly shown in Fig. 1. When the knob is to be applied to the spindle, the end of the spindle is introduced into the knobsleeve until the spring is in engagement with the toothed portion of the said sleeve. The cross-sectional dimensions of the knob-spindle at the higher or inner recessed portion 10 is slightly less than the dimensions of the opening in the sleeve adapted to receive the spindle, so that the spring, when the spindle is introduced into the knob-sleeve, will engage with the teeth to such an extent that the spindle cannot be withdrawn from the knob until a suitable device is employed to efiect a release. If the door is quite thin, the knobspindle will be carried within the knob-sleeve until the spring 11 engages with the outermost notch 14, as shown in Fig. 1, and the inner end of the sleeve will at that time be in engagement with the shoulder 15, produced by the recess 10. If the door is quite thick, the spring of the spindle will engage with the inclined surface of the first tooth from the inner end of the sleeve, having bearing against the inner end wall of the slot.

When it is desired to remove the knob from the spindle, this may be accomplished by forcing downward into the opening 13 in the knob-sleeve a plate 16, a fiatpiece of metal, or a screw-driver, either of which devices can be brought in engagement with the spring, and by forcing the spring downward into the innermost inclined surface of the lower recess I slightly less than the cross-sectional diqnen sions of the'opening in said sleeve which re ceives the spindle, the said face of said spin- 1 die being also provided with a recess 10 deeper than the recess 10 and having its bot- 7 tom inclined from its center in opposite directions, and a, spring secured to. the outer inclined portion of said recess 10 and extendingu-pwardl-y at an angle to the spindle, its

free end being about on a level With the hori- -zontal plane of the unrecessed portion of the spindle, said free end appearing at the slot of the knob-sleeve and engaging the teeth therein and being capable of being depressed into the inner inclined portion of the recess T10 by an instrument inserted through the slot of the sleeve, as and for the purpose set forth.

FREDERICK JONES. JAMES S. BROWNSON.

Witnesses:

ALBERT J. FAUSS, J. H. OONBOY. 

